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/* $Id: display.cpp $ */
/** @file
* X11 guest client - display management.
*/
/*
* Copyright (C) 2006-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "VBoxClient.h"
#include <iprt/errcore.h>
#include <iprt/file.h>
#include <iprt/mem.h>
#include <iprt/string.h>
#include <X11/Xlib.h>
#include <X11/Xatom.h>
#include <X11/extensions/Xrandr.h>
/** @todo this should probably be replaced by something IPRT */
/* For system() and WEXITSTATUS() */
#include <stdlib.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <limits.h>
#include <poll.h>
#include <time.h>
/* TESTING: Dynamic resizing and mouse integration toggling should work
* correctly with a range of X servers (pre-1.3, 1.3 and later under Linux, 1.3
* and later under Solaris) with Guest Additions installed. Switching to a
* virtual terminal while a user session is in place should disable dynamic
* resizing and cursor integration, switching back should re-enable them. */
/** Display magic number, start of a UUID. */
#define DISPLAYSTATE_MAGIC UINT32_C(0xf0029993)
/** State information needed for the service. The main VBoxClient code provides
* the daemon logic needed by all services. */
struct DISPLAYSTATE
{
/** The service interface. */
struct VBCLSERVICE *pInterface;
/** Magic number for sanity checks. */
uint32_t magic;
/** Are we initialised yet? */
bool mfInit;
/** The connection to the server. */
Display *pDisplay;
/** The RandR extension base event number. */
int cRREventBase;
/** Can we use version 1.2 or later of the RandR protocol here? */
bool fHaveRandR12;
/** The command argument to use for the xrandr binary. Currently only
* used to support the non-standard location on some Solaris systems -
* would it make sense to use absolute paths on all systems? */
const char *pcszXrandr;
/** Was there a recent mode hint with no following root window resize, and
* if so, have we waited for a reasonable time? */
time_t timeLastModeHint;
};
static unsigned char *getRootProperty(struct DISPLAYSTATE *pState, const char *pszName,
long cItems, Atom type)
{
Atom actualType = None;
int iFormat = 0;
unsigned long cReturned = 0;
unsigned long cAfter = 0;
unsigned char *pData = 0;
if (XGetWindowProperty(pState->pDisplay, DefaultRootWindow(pState->pDisplay),
XInternAtom(pState->pDisplay, pszName, 0), 0, cItems,
False /* delete */, type, &actualType, &iFormat,
&cReturned, &cAfter, &pData))
return NULL;
return pData;
}
static void doResize(struct DISPLAYSTATE *pState)
{
/** @note The xrandr command can fail if something else accesses RandR at
* the same time. We just ignore failure for now as we do not know what
* someone else is doing. */
if (!pState->fHaveRandR12)
{
char szCommand[256];
unsigned char *pData;
pData = getRootProperty(pState, "VBOXVIDEO_PREFERRED_MODE", 1, XA_INTEGER);
if (pData != NULL)
{
RTStrPrintf(szCommand, sizeof(szCommand), "%s -s %ux%u",
pState->pcszXrandr, ((unsigned long *)pData)[0] >> 16, ((unsigned long *)pData)[0] & 0xFFFF);
int rcShutUpGcc = system(szCommand); RT_NOREF_PV(rcShutUpGcc);
XFree(pData);
}
}
else
{
const char szCommandBase[] =
"%s --output VGA-0 --auto --output VGA-1 --auto --right-of VGA-0 "
"--output VGA-2 --auto --right-of VGA-1 --output VGA-3 --auto --right-of VGA-2 "
"--output VGA-4 --auto --right-of VGA-3 --output VGA-5 --auto --right-of VGA-4 "
"--output VGA-6 --auto --right-of VGA-5 --output VGA-7 --auto --right-of VGA-6 "
"--output VGA-8 --auto --right-of VGA-7 --output VGA-9 --auto --right-of VGA-8 "
"--output VGA-10 --auto --right-of VGA-9 --output VGA-11 --auto --right-of VGA-10 "
"--output VGA-12 --auto --right-of VGA-11 --output VGA-13 --auto --right-of VGA-12 "
"--output VGA-14 --auto --right-of VGA-13 --output VGA-15 --auto --right-of VGA-14 "
"--output VGA-16 --auto --right-of VGA-15 --output VGA-17 --auto --right-of VGA-16 "
"--output VGA-18 --auto --right-of VGA-17 --output VGA-19 --auto --right-of VGA-18 "
"--output VGA-20 --auto --right-of VGA-19 --output VGA-21 --auto --right-of VGA-20 "
"--output VGA-22 --auto --right-of VGA-21 --output VGA-23 --auto --right-of VGA-22 "
"--output VGA-24 --auto --right-of VGA-23 --output VGA-25 --auto --right-of VGA-24 "
"--output VGA-26 --auto --right-of VGA-25 --output VGA-27 --auto --right-of VGA-26 "
"--output VGA-28 --auto --right-of VGA-27 --output VGA-29 --auto --right-of VGA-28 "
"--output VGA-30 --auto --right-of VGA-29 --output VGA-31 --auto --right-of VGA-30";
char szCommand[sizeof(szCommandBase) + 256];
RTStrPrintf(szCommand, sizeof(szCommand), szCommandBase, pState->pcszXrandr);
int rcShutUpGcc = system(szCommand); RT_NOREF_PV(rcShutUpGcc);
}
}
/** Main loop: handle display hot-plug events, property updates (which can
* signal VT switches hot-plug in old X servers). */
static void runDisplay(struct DISPLAYSTATE *pState)
{
Display *pDisplay = pState->pDisplay;
long cValue = 1;
/* One way or another we want the preferred mode at server start-up. */
doResize(pState);
XSelectInput(pDisplay, DefaultRootWindow(pDisplay), PropertyChangeMask | StructureNotifyMask);
if (pState->fHaveRandR12)
XRRSelectInput(pDisplay, DefaultRootWindow(pDisplay), RRScreenChangeNotifyMask);
/* Semantics: when VBOXCLIENT_STARTED is set, pre-1.3 X.Org Server driver
* assumes that a client capable of handling mode hints will be present for the
* rest of the X session. If we crash things will not work as they should.
* I thought that preferable to implementing complex crash-handling logic.
*/
XChangeProperty(pState->pDisplay, DefaultRootWindow(pState->pDisplay), XInternAtom(pState->pDisplay, "VBOXCLIENT_STARTED", 0),
XA_INTEGER, 32, PropModeReplace, (unsigned char *)&cValue, 1);
/* Interrupting this cleanly will be more work than making it robust
* against spontaneous termination, especially as it will never get
* properly tested, so I will go for the second. */
while (true)
{
XEvent event;
struct pollfd PollFd;
int pollTimeOut = -1;
int cFds;
/* Do not handle overflow. */
if (pState->timeLastModeHint > 0 && pState->timeLastModeHint < INT_MAX - 2)
pollTimeOut = 2 - (time(0) - pState->timeLastModeHint);
PollFd.fd = ConnectionNumber(pDisplay);
PollFd.events = POLLIN; /* Hang-up is always reported. */
XFlush(pDisplay);
cFds = poll(&PollFd, 1, pollTimeOut >= 0 ? pollTimeOut * 1000 : -1);
while (XPending(pDisplay))
{
XNextEvent(pDisplay, &event);
/* This property is deleted when the server regains the virtual
* terminal. Force the main thread to call xrandr again, as old X
* servers could not handle it while switched out. */
if ( !pState->fHaveRandR12
&& event.type == PropertyNotify
&& event.xproperty.state == PropertyDelete
&& event.xproperty.window == DefaultRootWindow(pDisplay)
&& event.xproperty.atom == XInternAtom(pDisplay, "VBOXVIDEO_NO_VT", False))
doResize(pState);
if ( !pState->fHaveRandR12
&& event.type == PropertyNotify
&& event.xproperty.state == PropertyNewValue
&& event.xproperty.window == DefaultRootWindow(pDisplay)
&& event.xproperty.atom == XInternAtom(pDisplay, "VBOXVIDEO_PREFERRED_MODE", False))
doResize(pState);
if ( pState->fHaveRandR12
&& event.type == pState->cRREventBase + RRScreenChangeNotify)
pState->timeLastModeHint = time(0);
if ( event.type == ConfigureNotify
&& event.xproperty.window == DefaultRootWindow(pDisplay))
pState->timeLastModeHint = 0;
}
if (cFds == 0 && pState->timeLastModeHint > 0)
doResize(pState);
}
}
static int initDisplay(struct DISPLAYSTATE *pState)
{
char szCommand[256];
int status;
pState->pDisplay = XOpenDisplay(NULL);
if (!pState->pDisplay)
return VERR_NOT_FOUND;
if (!XRRQueryExtension(pState->pDisplay, &pState->cRREventBase, &status))
return VERR_NOT_FOUND;
pState->fHaveRandR12 = false;
pState->pcszXrandr = "xrandr";
if (RTFileExists("/usr/X11/bin/xrandr"))
pState->pcszXrandr = "/usr/X11/bin/xrandr";
status = system(pState->pcszXrandr);
if (WEXITSTATUS(status) != 0) /* Utility or extension not available. */
VBClFatalError(("Failed to execute the xrandr utility.\n"));
RTStrPrintf(szCommand, sizeof(szCommand), "%s --q12", pState->pcszXrandr);
status = system(szCommand);
if (WEXITSTATUS(status) == 0)
pState->fHaveRandR12 = true;
return VINF_SUCCESS;
}
static const char *getPidFilePath()
{
return ".vboxclient-display.pid";
}
static struct DISPLAYSTATE *getStateFromInterface(struct VBCLSERVICE **ppInterface)
{
struct DISPLAYSTATE *pSelf = (struct DISPLAYSTATE *)ppInterface;
if (pSelf->magic != DISPLAYSTATE_MAGIC)
VBClFatalError(("Bad display service object!\n"));
return pSelf;
}
static int init(struct VBCLSERVICE **ppInterface)
{
struct DISPLAYSTATE *pSelf = getStateFromInterface(ppInterface);
int rc;
if (pSelf->mfInit)
return VERR_WRONG_ORDER;
rc = initDisplay(pSelf);
if (RT_FAILURE(rc))
return rc;
if (RT_SUCCESS(rc))
pSelf->mfInit = true;
return rc;
}
static int run(struct VBCLSERVICE **ppInterface, bool fDaemonised)
{
RT_NOREF1(fDaemonised);
struct DISPLAYSTATE *pSelf = getStateFromInterface(ppInterface);
if (!pSelf->mfInit)
return VERR_WRONG_ORDER;
runDisplay(pSelf);
return VERR_INTERNAL_ERROR; /* "Should never reach here." */
}
struct VBCLSERVICE vbclDisplayInterface =
{
getPidFilePath,
init,
run,
VBClServiceDefaultCleanup
};
struct VBCLSERVICE **VBClGetDisplayService()
{
struct DISPLAYSTATE *pService = (struct DISPLAYSTATE *)RTMemAlloc(sizeof(*pService));
if (!pService)
VBClFatalError(("Out of memory\n"));
pService->pInterface = &vbclDisplayInterface;
pService->magic = DISPLAYSTATE_MAGIC;
pService->mfInit = false;
return &pService->pInterface;
}
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